Elevator



(No Model.)

- A. MOEAGHRAN,

ELEVATOR,

Patented Apr. 12, 1892.

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ANDREW MCEACI-IRAN, OF FITOHBURG, MASSACHUSETTS.

ELEVATOR.

SPECIFICATION forming part of Letters Patent N0. 472,? 68, dated April12, 1892.

Application filed January 18, 1892- Serial No. 418,399. (No model.)

To all whom it may concern.-

Be it known that I, ANDREW MoEAoHRAN,

of Fitchburg, in the county of Worcester, State of Massachusetts,haveinvented certain new and useful Improvements in Elevators, of which thefollowing is a description sufficiently full, clear, and exact to enableany person skilled in the art or science to which said inventionappertains to make ,and use the same, reference being had to theaccompany-v ing drawings, forming part of this specification, in whichFigure l is an elevation of an elevator well and car provided with myimprovement; Fig. 2, a vertical transverse section of the same, showingthe safety-clutch in operation; Fig. 3, a like View showing the clutchmechanism in its normal position; and Fig. 4, a horizontal section ofthe well, taken above the car.

Like letters of reference indicate corresponding parts in the differentfigures of the drawings.

My invention relates especially to a safetyclutch lifting mechanism forelevator-cars; and it consists in certain novel features hereinafterfully set forth and claimed, the object being to produce a simpler,cheaper, and more effective device of this character than is now inordinary use.

The nature and operation of the improvement will be readily understoodby all conversant with such matters from the following explanation.

In the drawings, A represents the well, at opposite sides of whichvertical ways I) are formed by a partition d. A vertical slot f isformed centrally in each partition cl, opening into the chambers b.

The car B may be of any desired form, and is provided at each side witha vertically-arranged fiange g, which slide in the slots f of thepartition d. Above each flange g and in alignment therewith there arespring-supported arms h, which slide in the slots f, the springst'beinginterposed between said arms and the flanges g and the car-walls beinggrooved to direct vertical play of said arms. On top of the car thereare two vertical lifting-loops j, and through said loops two levers isproject loosely, the inner ends on thereof overlapping the verticalcenter of the car. The lifting-cord O incloses said overlapping leverends. The levers project through the respective way-slots f, and arefulcrumed at p on the upper end of the spring-supported arms h, whichare sharpened to form a bearing therefor. Within the chambers 19 a shoe(1 is pivoted eccentrically on the ends of said levers in position toengage the inner faces of the partitions 01. Outside said chamber asimilar shoe r is pivoted eccentrically to each lever in a horizontalplane below that of the pivot of the shoes q. The f ulcru ms p are thusdiposed centrally between said pivots.

In the normal position of the parts, the lifting-cord 0 being taut, theweight of the car is supported by the loopsj on the long arm of thelevers, said levers being fulcrumed on the arms h on said car and thesprings 7; compressed, as shown in Fig. 3. In this position the shoes qr are out of engagement with the partition d and do not interfere withthe sliding of the car in either direction. Should the lifting-cord 0break, the springs 'i, actingexpansively, force the fulcrum-arms hupward, the loops j depressing the long arm of the levers, as shown inFig. 2. This forces the shoes q 1 into engagement with opposite facesrespectively of the partitions d, causing them to grip the same andarrest the downward movement of the car by frictional contact.

As soon as tension is again exerted on the lifting-cord elevating thelong arms of the levers the contact of the shoes with the walls d of thepartition is broken and the car permitted to slide freely. A singlelever 70 may be employed to effect the result described by mounting theloop j centrally of the car and disposing the lifting-cord eccentricallythereof.

It will be understood that a hook or other suitable device may besubstituted for the loops j on the car, if desired.

I do not confine myself to mounting the spring-supported fulcrum inalignment with the flanges g, as they may be supported on the ends offlat springs secured to the car-top or in any other suitable manner ifadapted to change the position vertically of the fulcrum in relation tothe car-body when the strain is relieved on the rope.

Having thus explained my invention, what I claim is- 1. A safety-clutchfor elevator-cars, comprising a lever mounted on a spring-pushed fulcrumon the car and projecting through a slot in the carways, twoclamping-shoes pivoted-to said lever respectively-at opposite sides ofits fulcrum and in position to engage opposite faces of said ways, theshoe-pivots being in different horizontal planes, a liftingrope securedto the innerend of said lever, and a connection between the lever andcarbody disposed between said rope and fulcrum, substantially asdescribed.

2. In an elevator, the combination, with the car and well having theslotted ways, of the spring-supported arms fitted to slide on the ANDREWMoEAOI-IRAN.

Witnesses:

ALIoE M. LAMB, OHAs. E. VVARE.

